What happens when a similar charge is placed on a soap bubble?
A
Its radius decreases
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B
Its radius increases
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C
The bubble collapses
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D
None of these
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Solution
The correct option is B
Its radius increases
Coulomb interaction
Attraction or repulsion of charges because of their charges is called as coulomb interaction.
Opposite charges attract each other. Like charges repel each other. Also a charged particle attracts an uncharged particle.
In all these interaction electrostatic force exists between particles.
Explanation
Correct answer is option B.
Soap bubble is in spherical shape. When a charge (either positive or negative) is placed on it, they get uniformly distributed.
As similar charges repel each other, these charges apply force of repulsion on each other. As a result pressure is applied on the surface of bubble resulting enlargement of its radius.
When the charge is placed on the soap bubble, every portion of the surface of the soap bubble has the same charge. As a result, each section of the soap bubble’s surface repels every other section of the surface, increasing the soap bubble’s size (radius)
